Introduction To Engineering Drawing
Summary
TLDRThis video lecture provides an introduction to engineering drawing, a technical form of communication used in various fields such as manufacturing, shipbuilding, and construction. It covers essential drawing instruments like the drawing board, t-square, set square, protractor, and compass, detailing their specific uses. Additionally, the video explains different types of lines, such as continuous thick lines for outlines, dashed lines for hidden edges, and chain lines for center representation. Overall, the lecture emphasizes how engineering drawings are a graphical language for communicating design information effectively.
Takeaways
- đ ïž Engineering drawing is a type of technical drawing used to clearly define requirements for engineered items like views and dimensions.
- đ It serves as a graphical language to communicate ideas and information from the engineer to the worker who will make the part.
- đą Engineering drawing is applied in various fields, such as shipbuilding, automobile aerodynamics, and construction.
- đïž Drawing instruments include drawing boards, drawing paper, pins, clips, pencils, t-squares, set squares, scales, drafter, roller scales, protractors, French curves, compasses, and erasers.
- đ The t-square is used to draw horizontal lines, while set squares help draw lines at specific angles.
- đ The drafter combines several tools like t-squares, set squares, scales, and protractors, allowing for easy movement and rotation to draw lines and angles.
- đš A French curve is used to draw complex curves such as ellipses and parabolas that cannot be drawn with a compass.
- đ Different types of lines in engineering drawing include continuous thick lines, continuous thin lines, dashed lines, and chain lines, each serving a specific purpose.
- âïž Pencils of varying grades (H, 2H, HB) are used to ensure precision in drawings, with the choice of pencil impacting the quality.
- đïž The eraser is used to remove pencil marks without damaging the paper, ensuring neatness in drawings.
Q & A
What is engineering drawing?
-Engineering drawing is a type of technical drawing used to clearly define the requirements for engineered items, including views, dimensions, and necessary information. It serves as a graphical language that communicates ideas and information from one person to another.
What is the primary purpose of engineering drawing?
-The primary purpose of engineering drawing is to communicate all necessary information from the engineer who designed a part to the worker who will manufacture it. It ensures that the design is accurately produced.
What are some fields where engineering drawing is applied?
-Engineering drawing is applied in various fields such as shipbuilding, automobile aerodynamics, and construction.
What is the function of the drawing board in engineering drawing?
-The drawing board is a rectangular piece of wood that serves as the base for drawing paper. It has a smooth surface and is cleated at the back to prevent warping, ensuring stability during drawing.
How is a t-square used in engineering drawing?
-A t-square is used to draw horizontal straight lines. It is fitted along the edge of the drawing board and consists of two parts, the stock and the blade, joined at right angles.
What are set squares and how are they used?
-Set squares are triangular tools used to draw lines at specific angles, typically 45°, 30°, 60°, and 90°. They are used in combination with the t-square for precision.
What is the purpose of a protractor in engineering drawing?
-A protractor is used to draw or measure angles. It is flat, semicircular, and graduated to one-degree divisions, making it easy to read angles from both ends.
What are French curves and when are they used?
-French curves are tools with various shapes used to draw curves that cannot be drawn with a compass, such as ellipses, parabolas, and hyperbolas.
What are the different types of lines used in engineering drawing?
-The different types of lines include continuous thick lines (for outlines and edges), continuous thin lines (for dimensions and projections), dashed lines (for hidden edges), chain thin lines (for center lines of circles and arcs), and others like freehand and zigzag lines for breaks.
What is the significance of lines in engineering drawing?
-Lines in engineering drawing are crucial as they convey specific information about an object's details. Different types of lines are used to represent various aspects, such as outlines, hidden edges, center lines, and cutting planes.
Outlines
đ Introduction to Engineering Drawing and Its Instruments
This paragraph introduces the concept of engineering drawing, which is a form of technical drawing used to define the specifications for engineered items, including views, dimensions, and other necessary details. It is described as a graphical language that conveys ideas and instructions between engineers and workers, and has applications in various industries like shipbuilding, automotive aerodynamics, and construction. The paragraph also lists essential drawing instruments, such as the drawing board, pencils, t-squares, and compasses, and highlights the importance of using quality materials for accurate results.
âïž Detailed Explanation of Drawing Instruments
This paragraph delves into the specifics of each drawing instrument. It starts with the drawing board, explaining its structure and use, followed by the selection of drawing paper and methods for securing it. Pencils are emphasized for their role in determining the accuracy of a drawing, and the paragraph describes various pencil grades like H, 2H, and HB. The t-square is detailed for its use in drawing horizontal lines, while set squares, scales, protractors, and French curves are explained for their functions in creating angles, measuring distances, and drawing curves. The paragraph concludes with a description of the compass, eraser, and the overall importance of precise instruments in technical drawings.
đ Different Types of Lines in Engineering Drawing
This section discusses the various types of lines used in engineering drawings. It starts with the continuous thick line, which is used to depict the main outline of a drawing, and continues with the continuous thin line, often used for dimensions and projections. Other lines mentioned include the freehand thin line for irregular boundaries, the thin line with zigzags for long breaks, and the dashed line for hidden edges. Each type of line has a specific purpose to accurately convey the details of an object in a technical drawing.
đ Review of Types of Lines and Instruments
The final paragraph provides a brief recap of the video lecture. It summarizes the key points covered, starting with the definition of engineering drawing as a technical drawing used for communicating the requirements for engineered items. The paragraph reviews the various instruments used in engineering drawing, including the drawing board, t-square, pencils, and French curves, and their specific uses. It also recaps the different types of lines used to depict various features in a drawing, thus encapsulating the main lessons from the lecture.
Mindmap
Keywords
đĄEngineering Drawing
đĄDrawing Instruments
đĄT-square
đĄSet Square
đĄProtractor
đĄCompass
đĄFrench Curve
đĄLines and Types of Lines
đĄContinuous Thick Line
đĄDrafter
Highlights
Introduction to engineering drawing as a technical drawing used to clearly define requirements for engineered items such as views and dimensions.
Engineering drawing is described as a graphical language that communicates ideas and information from the engineer to the worker.
Applications of engineering drawing include ships manufacturing, aerodynamics of automobiles, and constructions.
List of essential drawing instruments: drawing board, drawing paper, pins, clips, pencils, t-square, set square, scale, drafter, roller scale, protractor, French curves, compass, and eraser.
Drawing board is rectangular, made of wood, and used to keep the drawing paper stable during drawing.
The quality and grade of pencils (H, 2H, HB) directly affect the accuracy and appearance of the drawing.
T-square consists of two partsâthe stock and the bladeâand is used to draw horizontal straight lines.
Set square, available in two common forms (45-45-90 degrees and 30-60-90 degrees), is used in combination with the t-square to draw angled lines.
The protractor, a semicircular instrument, is used to draw or measure angles, with graduation marks for degrees.
A drafter combines a t-square, set square, scale, and protractor, allowing for adjustable angles and movement on the drawing board.
The roller scale, featuring a roller, is used to draw vertical, horizontal, and parallel lines, as well as angles and circles.
French curves, available in various shapes, are used to draw curves that cannot be drawn with a compass, such as ellipses and parabolas.
Various types of lines are used in engineering drawing, including continuous thick lines for outlines, continuous thin lines for dimensions, and dashed lines for hidden edges.
Chain thin lines with thick ends are used to represent the location of a cutting plane in the drawing.
The video concludes with a quick review of the importance of engineering drawing as a communication tool, its instruments, and different types of lines used to represent objects.
Transcripts
in this easy 8 video lecture we will
learn what is engineering drawing
drawing instruments and uses and lines
and types of lines first we will see
what is engineering drawing engineering
drawing is a type of technical drawing
which is used to clearly define the
requirements for engineered items such
as views dimensions and necessary
information more than drawing pictures
it is also a language a graphical
language that communicates ideas and
information from one mind to another
most important it communicates all
needed information from the engineer who
designed a part to the worker who will
make it application of engineering
drawing is used in ships manufacturing
aerodynamics of automobiles
constructions etc let us see different
drawing instruments used in engineering
drawing in this we have a drawing board
drawing paper pins clips or odysseus
pencils t-square set square scale
drafter ruler scale protractor French
curves compass and eraser hey it's time
to concentrate now now let us describe
each and every instrument drawing board
is rectangular in shape and is made of
wood about 25 mm thick it is cleated at
the back by 2 battens to prevent warping
the surface of the board should be
smooth and is used to keep the drawing
paper there is a working inch at the
side of the drawing board while
selecting a drawing paper we have to be
sure that the size of the paper is
smaller than the drawing board to hole
destroying paper we use pins or clips or
other save tapes pencils are basically
used to draw the accuracy and appearance
of a drawing depends on the quality of
the pencils used the grade of pencils H
2 H and H B are mostly used next is the
t-square it is made of two parts the
stock and the blade which are joined
together at right angles by means of
screws and pins t-square is fitted at
the side of the drawing board and its
along the edge of the board and is used
to draw horizontal straight lines set
square is triangular in shape with one
of the angles as right angle two forms
of the set square are generally used one
having angles 45 45 and 90 degree and
the other is 30 60 90 set square is a
combination with t-square is used to
draw lines at an angle a scale is used
to draw lines of specific lengths
protractor is flat and semicircular in
shape
it's circumferential edge is graduated
to one degree divisions and is numbered
and every 10 degree interval and is
readable from both the ends the
protractor is used to draw or measure
angles the combination of a t-square a
set square scales and a protractor is a
drafter it's one end is clamped by means
of a screw at the edge of the drawing
board the other end is adjustable it has
a scale which is at 90 degree and also
has a protractor which can be rotated at
certain angles this scale can be moved
anywhere we want within its limits
next is a roller scale it has a roller
in it it is used for drawing vertical
lines horizontal lines parallel lines
angles and circles next instrument is
the French curve they are made in
various shapes one of which is shown
here French curve is used for drawing
curves which cannot be drawn with a
compass it is used to draw curves like
ellipse parabola hyperbola etc a compass
is used to draw a circle of a specific
radius and an arc at a specific distance
soft Indian rubber is widely used to
erase pencil drawings the eraser should
be such that it does not spoil the
surface of the paper
next we will see lines and types of
lines just as in any textbook we are
thought to use the correct words for
making correct sentences similarly in
engineering drawing the details of
various objects are drawn by different
types of lines various types of lines
are used in engineering drawing
now let us see the different types of
lines first is a continuous thick line
this line is used to display outline and
edges of the main drawing next is the
continuous thin line this line is
basically used for dimension extension
projection leaders hatching etc next is
a continuous thin freehand line this
line is used to show short break or
irregular boundaries next is the
continuous thin line with zigzags this
line is used to show long break next is
the dashed line this line is used to
show hidden edges of the main object
next is the chain thin line long -
dotted this line is used to represent
the center line for circles and arcs
next is the chain thin line with thick
at the ends this line is used to
represent the location of a cutting
plane
let us take a quick review of what we've
learned in this video lecture first we
have seen that engineering drawing is a
type of a technical drawing which is
used to clearly define the requirements
for engineered items such as views
dimensions and necessary information it
is also called as graphical language and
helps to communicate next we have seen
different drawing instruments used in
engineering drawings such as drawing
board drawing paper pins clips or this.f
tapes pencils t-square set square scale
drafter roller scale protractor French
curves compass and eraser and their uses
finally we have seen different types of
lines used in engineering drawing to
draw an object so this is the overview
of our video lecture
5.0 / 5 (0 votes)